/Engine/Source/Runtime/GeometryCore/Public/DynamicMesh/DynamicMeshAttributeSet.h
Attach a new attribute (and transfer ownership of it to the attribute set)
void AttachAttribute ( [FName](API\Runtime\Core\UObject\FName) AttribName, [FDynamicMeshAttributeBase](API\Runtime\GeometryCore\DynamicMesh\FDynamicMeshAttributeBase) * Attribute )